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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986c255edc1019b78da4602b036b74605b4b40b5c11c4c080d70519bef4280a2' 
  AND token = 'DgNfMSh3xU6CxYhzLhP+iWO10b95XnrcTSD7c/raNRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}